Diffrence between the tablespace is ONLINE and READ WRITE?
Hi all
I'm very confused on the tablespace is ONLINE and READ WRITE?
Some say that if the tablespace is online, this means that its READ WRITE and when its offline then its READ-only.
So, what is the difference between them:
ALTER TABLESPACE offline tablespacename; -> done mean READ only now?
ALTER TABLESPACE tablespacename online; -> is it means its READ WRITE now?
If Yes, then what is the use of the following command if above 2 commands? :
ALTER TABLESPACE tablespacename [READ ONLY |] READING WRITING];
Kind regards
Confused Ritu
In addition, when the tablespace is offline, objects belonging to those who are not available for use to users. You wouldn't be able to query for objects in a tablespace offline.
When the tablespace is read only - no write operation cannot be performed i.e. etc. INSERT/UPDATE/DEL. Oracle says that read-only tablespaces provides a way to protect the historical data so that users cannot modify it. You can drop objects, such as tables or indexes, to a tablespace read-only, but you can't create or modify objects in a tablespace read only
In order to bring a tablespace OFFLINE to ONLINE - so that it is available to users, you must "ALTER TABLESPACE online tablespacename" command. A tablespace online can be READ ONLY or READ WRITE mode.
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